Also try Amazon.com and google with US part numbers!Energizer 246Neda 1602

But cheaper to make your own with 6 x Alkaline AAA (or 5 x AA will fit if soldered and whatever it is will work 5V to 7.6V). Not sure if a 2 x 3 layout 6 x AAA holder fits 34 x 36 mm x 70mm, but seems plausible. One I've not "done" yet.

There is very little room inside the set. It is a 1960,s Binatone CTR620 clock radio. The mechanical clock works fine and with a PP3 fitted i can pick up a couple of weak stations up. There is a exact set on ebay at the moment under the Bambino brand.

Maplin would like about 13 Euro for a PP9 or a 996 here. I can get Eveready 996 3.50 to 4.00 and some brand I never heard of for €2 a Cheap source of "F" cells. Though I was amazed my Decca Transistor set takes 2 x 996 native!The PP9's I refill with 6 x AA Alkaline.